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I'd say it depends what you want from your device. If you want a longer term iOS support, I'd go with the iPad 2, I can't see Apple supporting the iPad 1 past iOS 5, as they've already discontinued them, and the iPad 1 has already had 2 major software updates, iOS 4 & 5.
In terms of hardware, iPad 2 is obviously better too. Even if you don't use FaceTime (not sure if you do use FaceTime) now, who's to say that sometime in the future you might want to FaceTime with family or something. Then you'd most likely want the bigger screen. Plus, you're not losing any hardware features with iPad 2, you're gaining features over iPad 1 (obviously)
Just my opinion.